isscalar

Test whether the input is a 1×1 scalar.

Syntax

tf = isscalar(A)

Description

Returns true when A has exactly one element (size 1 along every dimension), and false otherwise. Always returns a single boolean — there is no elementwise variant.

Examples

isscalar(7)           % 1
isscalar([1 2 3])     % 0
isscalar([])          % 0
isscalar('hello')     % 0  (strings of length > 1 are vectors)

See also

• isvector — Test whether the input is a vector (one row or one column).
• isempty — Test whether the input has zero elements.
• size — Sizes along all dimensions, or along one specific dimension.
• numel — Total number of elements.